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GEOGRAPHY
TECTONIC HAZARDS
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Cards (20)
Focus
Point
below
the Earth's surface where the rocks give way in an
earthquake
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Epicenter
Point directly above the
focus
where the
earthquake
hits worst
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Plate boundary
Also known as
plate margins
, where two or more
plates
meet and there is more
tectonic
activity
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Richter
Scale
Outdated measure of the
magnitude
or
strength
of an
earthquake
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Seismometer
Machine that measures the
vibrations
from an
earthquake
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Types of plate margins
Destructive
Constructive
Conservative
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At
destructive
plate boundaries, two plates move towards each other, often forming
fold
mountains or
subduction
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At
conservative
plate boundaries, two plates move side-by-side, building up pressure that can lead to powerful
earthquakes
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Natural hazard
Natural event that is a
threat
to
property
and a threat to people
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Earthquakes
occur at
all
types of plate margins
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The San Andreas Fault is a
conservative plate boundary
, so it does not have
active volcanoes
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Plate margin types
Constructive
Destructive
Conservative
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Constructive
plate margins have plates moving apart, forming rift valleys and shield
volcanoes
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Destructive plate
margins
have plates moving together, causing
subduction
and composite volcanoes
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Conservative plate margins have plates moving side-by-side, with no
magma
and no
volcanoes
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Tectonic plates do not move side-by-side at
destructive
plate margins, that happens at
conservative
plate margins
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Tectonic plates move towards each other at destructive plate
margins
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Tectonic plates do not move away from each other at
conservative
plate margins, that happens at
constructive
plate margins
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Volcanoes and earthquakes are found at destructive plate margins
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Plate margins
are areas with a high risk of
volcanic eruptions
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